If you use assistive technology (such as a screen reader) and need a
version of this document in a more accessible format, please email firstname.lastname@example.org.
Please tell us what format you need. It will help us if you say what assistive technology you use.
This guidance was originally published by the Office of Fair Trading (OFT) and has been adopted by the CMA Board. The original text has been retained unamended, therefore it does not reflect or take account of developments in case law, legislation or practice since its original publication.